Question about 2006 Harley Davidson XL 1200 C Sportster Custom

1 Answer

My 2006 1200c gets alot of oil in the air filter but im told there was no umbrella valves deigned in this model is this true

Posted by on


1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.

    Brigadier General:

    An expert that has over 10,000 points.

  • Master
  • 4,565 Answers

Since there is no "center section" to the rocker boxes, there is umbrella valve in there. There is a "breather" in there however. Now, whether or not it will cause excessive oil to get into the air filter, I don't know. I don't work on models as new as this. It's simple enough to put the front rocker box and check. Take a look here.

Good Luck

Posted on Aug 04, 2010


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi there,
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.

Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.

Here's a link to this great service

Good luck!

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

Where is the umbrella valve on a harley davidson

The umbrella valve is inside the rocker box cover, inside along with the rocker arms and valve springs

Apr 15, 2013 | 2009 Harley Davidson FLHX Street Glide

1 Answer

Oil in air cleaner on a harley davidson 2006 883 sportster

Hi Georgianna, oil leaking from your air cleaner is caused by oil carryover from the engine. For what ever reason the breather system is not seperating enough oil mist and air from the piston downstroke. There are cheap and quick easy fixes and there are more exspensive ones. Start by trying the following:
1. Run your oil level half way between the add and full mark when hot.
2. Run oil breather lines from head into a TEE fitting below carb/induction module then a single line into a mini filter under frame.
3. Purchase Arlen Ness Super Sucker.
4. Replace umbrella valves and realign oil pump
5. Upgrade oil pump and cam plate
Good luck and have nice day.

Btw, I’m available to help over the phone in case u need at

Jul 22, 2012 | 2006 Harley Davidson XL 883C Sportster 883...

1 Answer

Harley Evo blowing oil through air filter. Isn't

Well, there is an "umbrella valve" in each of the center sections of the rocker box. These can and do get brittle from the repeated heating and cooling. They do a good job of keeping the bulk of oil out of the air filter but they can't get it all. As will all previous Harleys, they blow a bit of oil and those that relieve their crankcase pressure into the air filter do still make a mess that must be cleaned out occasionally. But, it shouldn't be excessive. Excessive blowby on the rings can exaggerate the problem.

To replace the "umbrella valves", simply take the bolts out of the rocker box cover and replace the gaskets and the valve. You will have to pull the fuel tanks to do this job.

Good Luck

May 21, 2011 | 2000 Harley Davidson FLSTC Heritage...

1 Answer

My02 sportster xl1200c is building up pressure incrankcase, i can tell by removing oil dipstick it releases pressure. what would cause this?

Your crankcase pressure is supposed to be vented though the heads. Take your air filter cover and the air filter off. The backing plate is held on by three small screws and two large bolts. These two large bolts are hollow and the vent the crankcase into the air filter as per EPA regulations. Check these and make sure they're open.

Now, this pressure gets to the breater tubes though an umbrella valve in the center section of the rocker box cover. This umbrella could have become brittle and flexing as it should be but I've never seen this.

Check the two large bolts and make sure someone hasn't closed these off to keep oil of the air filter. This is common if someone has changed the air filter assembly.

Good Luck

Aug 27, 2010 | 2002 Harley Davidson XL 1200 C Sportster...

1 Answer

After riding for awhile and I turn off the bike I get drips of oil coming out of the air cleaner .

It depends on the year model of your bike. This thread says your bike is a 01 FXDXT Super Glide. Since 1994, all Harley engines have been what we call "head breathers". The crankcase ventilation is done through ports in the heads unlike previous years where the engine breathed thorough a port in the lower crankcase. In each version, there are baffles to seperate the oil mist from the air. The later version "Head breathers" were better at this than the earlier versions. Still some oil is blown into the air cleaner and makes the removal and cleaning of the inside of the air filter necessary.

However if there is too much oil building up too quickly, in the head breather models there are small "umbrella" valves in the center part of the rocker box covers that over time become brittle due to head. It's not very difficult to take the top off the rocker box cover and replace these umbrellas if you have the proper tools and know how.

On the twin cam engines, there are six bolts holding the top plate on the rocker box cover. Remove these six bolts and the top plate and the center plate come off the head. The umbrella valve is in the center part. Simply remove the old umbrella and pull in the new on in the proper direction. Replace the rocker box covers with new gaskets.

Apr 06, 2010 | 2001 Harley Davidson FXDXT Dyna Super...

1 Answer

Harley motorbike why blow back thru new motor 4000 k,old

Regrettfully, all Harley engines suffer from this problem to a greater or lesser degree. It is due to the use of the single crankpin design of the engine. This design is what gives the Harley-Davidson it's distinctive sound but it does create a tremendous amount of crankcase pressure. This is due to the two very large piston moving up and down in unison with each other.

The late model engines went to what we call a "head breather" design in that crankcase pressure is relieved at the top of the engine rather than the earlier design that relieved the pressure at the lower side of the engine. This is accomplished by the use of "umbrella valves" in the center piece of the rocker box covers. The "umbrella valves" are made of synthetic rubber and open and close the breather passages from the rocker box to the air filter box by flexing in responce to the crankcase pressure. Due to repeated heating and cooling, the umbrella valve gets a bit stiff and fails to seal completely allowing oil to be blown into the air filter. Sportsters are more subject to the problem than the Big Twins for some reason.

Most people purchase one of the aftermarket crankcase breather systems and install this or they simply reroute the crankcase breather to the underside of the engine using longer hoses and plug the holes in the backside of the air filter assembly.

However, if the laws in your area preclude you of making any modifications such as this, I would purchase a K&N washable filter and install it in the air filter assembly. These filter are washable and can be cleaned and reused over and over again. As I said, this oil getting into the air filter is aggrevating but also normal unless it gets to where it's pouring out everytime you ride it after cleaning. At point, you need to replace the gaskets and umbrella valve in the rocker boxes. Good Luck

Dec 20, 2009 | 2000 Harley Davidson XL 1200 S Sportster...

1 Answer

Some mb dealers say they change oil and filter and air filters and cabin filter but they dont they charge you for this service this happens alot in florida

If this is the case contact DVM of your state they regulate thier license to service vechicles form a complaint with them if you can prove this to be true. They cant repair with a suspended license. But this is based by the state IM in IM not sure if FL is the same with licensing

Jul 10, 2009 | 2005 Mercedes-Benz Mercedes Benz E320 Cdi

1 Answer

Oil comming out of air intake

replace your pcv valve. this should fix it.

Dec 31, 2008 | 1996 Ford Explorer

7 Answers

Oil blow out the breather

This is a common problem on all sportsters, they have an oil blow by that dumps it into the air filter. I have found that if I run about a half quart low the problem goes away.

Nov 10, 2008 | 2000 Harley Davidson XL 1200 C Sportster...

Not finding what you are looking for?
2006 Harley Davidson XL 1200 C Sportster Custom Logo

250 people viewed this question

Ask a Question

Usually answered in minutes!

Top Harley Davidson Experts

Arnie Burke
Arnie Burke

Level 3 Expert

5055 Answers


Level 3 Expert

4354 Answers


Level 3 Expert

81342 Answers

Are you a Harley Davidson Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides